[Qgis-user] Diameter of buffers (Herbert Faber)

Thu Jan 17 00:13:43 PST 2019

Thanks!
I didn't know that and I will give it try.

Herbert

________________________________
Van: Qgis-user <qgis-user-bounces at lists.osgeo.org> namens qgis-user-request at lists.osgeo.org <qgis-user-request at lists.osgeo.org>
Verzonden: maandag 14 januari 2019 15:39
Aan: qgis-user at lists.osgeo.org
Onderwerp: Qgis-user Digest, Vol 155, Issue 32

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Today's Topics:

   1. Re: Vector Affine trouble (Mike Shand)
   2. Re: Vector Affine trouble (Nicolas Cadieux)
   3. Re: QGIS 3 - Postgres Authentication Issue (Luigi Pirelli)
   4. Re: Different behaviour Raster Calculater under Raster menu
      vs Processing Toolbox (Luigi Pirelli)
   5. Diameter of buffers (Herbert Faber)
   6. Re: Diameter of buffers (Jorge Gustavo Rocha)

----------------------------------------------------------------------

Message: 1
Date: Sun, 13 Jan 2019 21:56:09 +0000
From: Mike Shand <Mike.Shand at glasgow.ac.uk>
To: "qgis-user at lists.osgeo.org" <qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] Vector Affine trouble
Message-ID: <f98ade2a-8d22-17ef-42c0-3935edbcd195 at glasgow.ac.uk>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Hi Rutger,

It would be useful to know the source for the digitised contours and the
procedure you used to create the shapefile.

You may have three options:
1. Go back to Adobe Illustrator and digitise some well defined known
reference points such as grid intersections or road junctions, with this
it should be possible in QGIS to move, scale and rotate the vector
contours to fit OpenStreetMap or OS Opendata online imagery of Mull and
Iona.
2. Request someone with the QGIS plug-ins qgisAffine or VectorBender
working to do the transformation for you.
3. Request someone with ArcGIS Spatial Adjustment to do the
transformation for you.

Regards,
Mike

On 13/01/2019 21:11, Rutger Emmelkamp wrote:
> Hello everybody,
>
> I’ve posted this question before and had some good suggestions (which
> I tried as good as I can) but I’m not there yet.
> I have this intricate contour lines map (.shp file) and after
> importing, it sits in Africa. Now I want to drag it to Scotland and
> make it fit. It’s not just the position, it also requires rotating and
> stretching to make it fit.
> I can’t get the qgisAffine or VectorBender plugins to work on qgis
> 3.4.3. and I don’t have any experience with GRASS7 commands which was
> one suggestion. (I wil look into that)
>
> Meanwhile, are there any other suggestions?
>
> Thanks again.
>
> Rutger
>
>
>
>
>
>
>
>
>
>
>
>> Op 13 jan. 2019, om 15:29 heeft Mike Shand <Mike.Shand at glasgow.ac.uk
>> <mailto:Mike.Shand at glasgow.ac.uk>> het volgende geschreven:
>>
>> Hi Rutger,
>>
>> If you have successfully converted your Adobe Illustrator file into
>> an ESRI shapefile (using Avenza MaPublisher or DXf export ?) please
>> first check the quality of the linework in QGIS. Any Illustrator
>> vector bezier curves will probably have been simplified to straight
>> lines.  To avoid the lines being too generalised use the Add Anchor
>> Points option in Illustrator several times if necessary to ensure the
>> curves are replicated by short straight line sections.
>>
>> If you are using MaPublisher
>> <https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdownload.avenza.com%2FDownloads%2FDocs%2FMAPublisher%2FMP90_TutorialGuide.pdf&data=02%7C01%7C%7C201c4f999dc74661f06a08d67a2e362e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636830736228238163&sdata=PABzKqg6KZ3v%2FG4qyxUieXRK3e6H8bBEoJe%2BGEv3mwM%3D&reserved=0>
>> there is the option to add the projection/datum.
>>
>> Another alternative using Dxf format is:
>> https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fchristopherwesson.azurewebsites.net%2F2016%2F04%2F08%2Fimporting-vectors-from-illustrator-into-a-gis-with-georeferencing%2F%23sthash.O3XCCqoR.dpbs&data=02%7C01%7C%7C201c4f999dc74661f06a08d67a2e362e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636830736228238163&sdata=A5D0xnVErd4bkYJgSvkTdVxXpJ%2BibSc8n4FwDAW%2Bbvc%3D&reserved=0
>>
>> Regards,
>> Mike
>>
>> On 12/01/2019 22:37, Rutger Emmelkamp wrote:
>>> Hello everybody,
>>>
>>> Hope someone can help me out this Saturday night (or Sunday or Monday) but no hurry!
>>>
>>> How to georeference an Illustrator vector image (contour line map) from a specific area?
>>> I have qgis 3.4.3 installed and qgisAffine and Vector Blender plugins don’t work for this version.
>>>
>>> I managed to turn the file into a .shp file and I see it somewhere off the coast of Ghana (coordinates 0,0) but how do I drag it into place?
>>> I think I’m looking for a Vector Affine Transformation plugin or menu but can’t find it.
>>>
>>> Hope someone can help me in the right direction.
>>>
>>> Thanks and have a nice weekend.
>>>
>>> Rutger
>>> _______________________________________________
>>> Qgis-user mailing list
>>> Qgis-user at lists.osgeo.org
>>> List info:https://lists.osgeo.org/mailman/listinfo/qgis-user
>>> Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>>
>

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------------------------------

Message: 2
Date: Sun, 13 Jan 2019 19:07:37 -0500
From: Nicolas Cadieux <nicolas.cadieux at archeotec.ca>
To: Mike Shand <Mike.Shand at glasgow.ac.uk>
Cc: "qgis-user at lists.osgeo.org" <qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] Vector Affine trouble
Message-ID: <39EFC433-901D-4D1E-A1A3-B1C1E6B4CC6C at archeotec.ca>
Content-Type: text/plain; charset="utf-8"

Hi,
If you are on Windows, you could always use the OSGEO4W installer and install both the 2.8 and 3x versions of QGIS.  This way, you could use the plugins for the 2.8 QGIS and that could solve the problem.
Nicolas

> Le 13 janv. 2019 à 16:56, Mike Shand <Mike.Shand at glasgow.ac.uk> a écrit :
>
> Hi Rutger,
>
> It would be useful to know the source for the digitised contours and the procedure you used to create the shapefile.
>
> You may have three options:
> 1. Go back to Adobe Illustrator and digitise some well defined known reference points such as grid intersections or road junctions, with this it should be possible in QGIS to move, scale and rotate the vector contours to fit OpenStreetMap or OS Opendata online imagery of Mull and Iona.
> 2. Request someone with the QGIS plug-ins qgisAffine or VectorBender working to do the transformation for you.
> 3. Request someone with ArcGIS Spatial Adjustment to do the transformation for you.
>
> Regards,
> Mike
>
>> On 13/01/2019 21:11, Rutger Emmelkamp wrote:
>> Hello everybody,
>>
>> I’ve posted this question before and had some good suggestions (which I tried as good as I can) but I’m not there yet.
>> I have this intricate contour lines map (.shp file) and after importing, it sits in Africa. Now I want to drag it to Scotland and make it fit. It’s not just the position, it also requires rotating and stretching to make it fit.
>> I can’t get the qgisAffine or VectorBender plugins to work on qgis 3.4.3. and I don’t have any experience with GRASS7 commands which was one suggestion. (I wil look into that)
>>
>> Meanwhile, are there any other suggestions?
>>
>> Thanks again.
>>
>> Rutger
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>> Op 13 jan. 2019, om 15:29 heeft Mike Shand <Mike.Shand at glasgow.ac.uk> het volgende geschreven:
>>>
>>> Hi Rutger,
>>>
>>> If you have successfully converted your Adobe Illustrator file into an ESRI shapefile (using Avenza MaPublisher or DXf export ?) please first check the quality of the linework in QGIS.  Any Illustrator vector bezier curves will probably have been simplified to straight lines.  To avoid the lines being too generalised use the Add Anchor Points option in Illustrator several times if necessary to ensure the curves are replicated by short straight line sections.
>>>
>>> If you are using MaPublisher there is the option to add the projection/datum.
>>>
>>> Another alternative using Dxf format is:
>>> https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fchristopherwesson.azurewebsites.net%2F2016%2F04%2F08%2Fimporting-vectors-from-illustrator-into-a-gis-with-georeferencing%2F%23sthash.O3XCCqoR.dpbs&data=02%7C01%7C%7C201c4f999dc74661f06a08d67a2e362e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636830736228238163&sdata=A5D0xnVErd4bkYJgSvkTdVxXpJ%2BibSc8n4FwDAW%2Bbvc%3D&reserved=0
>>>
>>> Regards,
>>> Mike
>>>
>>>> On 12/01/2019 22:37, Rutger Emmelkamp wrote:
>>>> Hello everybody,
>>>>
>>>> Hope someone can help me out this Saturday night (or Sunday or Monday) but no hurry!
>>>>
>>>> How to georeference an Illustrator vector image (contour line map) from a specific area?
>>>> I have qgis 3.4.3 installed and qgisAffine and Vector Blender plugins don’t work for this version.
>>>>
>>>> I managed to turn the file into a .shp file and I see it somewhere off the coast of Ghana (coordinates 0,0) but how do I drag it into place?
>>>> I think I’m looking for a Vector Affine Transformation plugin or menu but can’t find it.
>>>>
>>>> Hope someone can help me in the right direction.
>>>>
>>>> Thanks and have a nice weekend.
>>>>
>>>> Rutger
>>>> _______________________________________________
>>>> Qgis-user mailing list
>>>> Qgis-user at lists.osgeo.org
>>>> List info: https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.osgeo.org%2Fmailman%2Flistinfo%2Fqgis-user&data=02%7C01%7C%7C201c4f999dc74661f06a08d67a2e362e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636830736228238163&sdata=3JmF9%2FNbhuo0wtyg2NRvb7%2Flhp7jfz8D%2FFWJf70C1OY%3D&reserved=0
>>>> Unsubscribe: https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.osgeo.org%2Fmailman%2Flistinfo%2Fqgis-user&data=02%7C01%7C%7C201c4f999dc74661f06a08d67a2e362e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636830736228238163&sdata=3JmF9%2FNbhuo0wtyg2NRvb7%2Flhp7jfz8D%2FFWJf70C1OY%3D&reserved=0
>>>
>>
>
> _______________________________________________
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------------------------------

Message: 3
Date: Mon, 14 Jan 2019 09:23:01 +0100
From: Luigi Pirelli <luipir at gmail.com>
To: "Ungerboeck, Erhard" <e.ungerboeck at esterhazy.at>
Cc: "qgis-user at lists.osgeo.org" <qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] QGIS 3 - Postgres Authentication Issue
Message-ID:
        <CAFO80_qqeP1KHJdFkDQQOj0wz=AYPfNZ94pOZbgNZWrmKaUcLQ at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

can you describe better the use case? I suppose you can't share project and
db connection, so you need to give us steps to replicate the issue starting
from a clean qgis profile.

remember that side effects can be introduced by plugins that are not using
correctly the qgis authentication infrastructure (if you use it). How do
you use the authentication? saving pwd int he project or in the qgis auth
infrastructure that need use of a master password?

Luigi Pirelli

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On Thu, 10 Jan 2019 at 12:01, Ungerboeck, Erhard <e.ungerboeck at esterhazy.at>
wrote:

> Hello,
>
>
>
> we are using QGIS  with a Postgres database where each different user (in
> total about 20 ) each have their own login credentials. Since we changed
> from QGIS 2.18 to QGIS 3 when opening a project QGIS always asks for the
> login data twice. I didn’t change anything in the database / server. This
> is rather annoying, any ideas how I can change that or can find further
> information / help?
>
>
>
> Best regards,
>
> Erhard
>
>
>
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
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------------------------------

Message: 4
Date: Mon, 14 Jan 2019 09:35:38 +0100
From: Luigi Pirelli <luipir at gmail.com>
To: Janneke van Dijk <janneke.qgis at gmail.com>
Cc: qgis-user ML <qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] Different behaviour Raster Calculater under
        Raster menu vs Processing Toolbox
Message-ID:
        <CAFO80_pOV2ejUwW8kuPbTLTHxnxoqJgOi64bjX-neOHoiETCKA at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

I've reintroduced the map calculator in the new processing
infrastructure... I created tests and I extensively tested with the help of
other users, but always is possible to hit a bug! Because I'm busy with
QGIS UserConf  organization, I would kindly ask if it's possible to trace
your issue filing a bug and assigning to me please.

in the meantime you can override or adapt the user manual trying with the
shining new (renintroduced) raster calculator via grass available in
master... btw this latter does not use GPU acceleration as recently
introduced only for core algorithms.

thank you to update the training material

regards

Luigi Pirelli

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On Fri, 11 Jan 2019 at 10:42, Janneke van Dijk <janneke.qgis at gmail.com>
wrote:

> Dear all,
>
> I'm testing the training manual (QGIS 3) and think I ran into a bug -
> unless I am misunderstanding something. I am doing the following, QGIS
> 3.4.3 on Windows:
>
> 1. Processing>Raster terrain analysis>Aspect: use the
> exercise_data\raster\SRTM\srtm_41_19.tif DEM as an input and use the
> default settings (data from
> https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fqgis%2FQGIS-Training-Data%2Farchive%2Fv2.0.zip&data=02%7C01%7C%7C201c4f999dc74661f06a08d67a2e362e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636830736228238163&sdata=EyRUXbxXZwwVDMcdRfOC8TJ25s4XHmJLRNwPGudbx60%3D&reserved=0)
>
> 2. Processing>Raster analysis>Raster calculator: "Aspect at 1" <= 90 OR
> "Aspect at 1">= 270 as expression, use the DEM layer for extents.
>
> 3. The resulting output gets created, but the information from provider
> shows "STATISTICS_VALID_PERCENT=0" and it does not have min and max values
>
> I have tried using a more simple expression like  "Aspect at 1" > 90 with
> the same result. Copying and pasting the expression in the Raster
> calculator under the menu Raster works as expected (values of 0 and 1).
> Using the Raster Calculator under Processing with another input layer
> and similar expression worked.
>
> So it seems that "something" when the aspect raster is created causes it
> "not to work" with the raster calculator under processing, while it
> still works with the RC under Raster.
>
> Can anyone confirm this is a bug?
>
> Thanks,
>
> Janneke
>
> _______________________________________________
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Message: 5
Date: Mon, 14 Jan 2019 14:21:07 +0000
From: Herbert Faber <herbert.faber at outlook.com>
To: "qgis-user at lists.osgeo.org" <qgis-user at lists.osgeo.org>
Subject: [Qgis-user] Diameter of buffers
Message-ID:
        <AM0PR06MB563551035B2FB0B36D05F0C9FE800 at AM0PR06MB5635.eurprd06.prod.outlook.com>

Content-Type: text/plain; charset="iso-8859-1"

Dear all,
When I put ring buffers arond dot objects, the diameter doesn't come out as I would expect.

For instance, when I try to make ring buffer with a distance of 100 meter and 25 segments around a dot object. The diameter of the buffer turns out to be approx 126 m when I measure it with the ruler tool.

What am I doing wrong?

I work with OSM Standard map in EPSG:3857 - WGS 84 / Pseudo-Mercator - projection and so are my shape files.

Best regards,
Herbert Faber
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Message: 6
Date: Mon, 14 Jan 2019 14:39:42 +0000
From: Jorge Gustavo Rocha <jgr at geomaster.pt>
To: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] Diameter of buffers
Message-ID: <c50e1e7d-5a0b-c7a3-4ba1-18cb2f374c6c at geomaster.pt>
Content-Type: text/plain; charset="windows-1252"

Hi Herbert,

You are using a Mercator based projection to calculate distances [1]. It
was not designed for distance calculations.

Can you reproject to your own national/local projected coordinate
system? Compute the buffers using it and compare the results.

Regards,

Jorge

[1] https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FMercator_projection&data=02%7C01%7C%7C201c4f999dc74661f06a08d67a2e362e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636830736228238163&sdata=sr76yuN0xkeMs%2F4LL4imfT%2FlDeuDWlILh%2FM9pa9u7sg%3D&reserved=0

Às 14:21 de 14/01/19, Herbert Faber escreveu:
> Dear all,
> When I put ring buffers arond dot objects, the diameter doesn't
> come out as I would expect.
>
> For instance, when I try to make ring buffer with a distance of 100
> meter and 25 segments around a dot object. The diameter of the buffer
> turns out to be approx 126 m when I measure it with the ruler tool.
>
> What am I doing wrong?
>
> I work with OSM Standard map in EPSG:3857 - WGS 84 / Pseudo-Mercator
> - projection and so are my shape files.
>
> Best regards,
> Herbert Faber
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
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Subject: Digest Footer

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End of Qgis-user Digest, Vol 155, Issue 32
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